linux-kernel - Re: [PATCH RFC 2/6] arm64: dts: qcom: ipq5424: Add the IMEM node

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Message-ID: <54efe237-01ea-4f98-8dbe-390d344aa6cf@oss.qualcomm.com>
Date: Fri, 11 Apr 2025 10:31:14 +0530
From: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH RFC 2/6] arm64: dts: qcom: ipq5424: Add the IMEM node


On 4/10/2025 12:11 AM, Konrad Dybcio wrote:
> On 4/8/25 10:49 AM, Kathiravan Thirumoorthy wrote:
>> Add the IMEM node to the device tree to extract debugging information
>> like system restart reason, which is populated via IMEM. Define the
>> IMEM region to enable this functionality. Corresponding DTS and driver
>> changes will be added incrementally.
>>
>> Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
>> ---
>>   arch/arm64/boot/dts/qcom/ipq5424.dtsi | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/ipq5424.dtsi b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
>> index 5d6ed2172b1bb0a57c593f121f387ec917f42419..a772736f314f46d11c473160c522af4edeb900b7 100644
>> --- a/arch/arm64/boot/dts/qcom/ipq5424.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
>> @@ -486,6 +486,15 @@ ssphy_0: phy@...00 {
>>   			status = "disabled";
>>   		};
>>   
>> +		sram@...0000 {
>> +			compatible = "qcom,ipq5424-imem", "syscon", "simple-mfd";
>> +			reg = <0 0x08600000 0 0x1000>;
>> +			ranges = <0 0 0x08600000 0x1000>;
> It looks like this should be a little longer


Yes. It is 112KB. But only first 4KB is accessible by all masters in the 
system, remaining regions are access protected by TZ. I shall mention 
this in the commit message in the next version.


>
> Konrad